SU702307A1 - Device for recording waveform of short periodic signals - Google Patents

Description

(54) DEVICE FOR REGISTRATION OF FORM OF PERIODIC SHORT SIGNALS

The invention relates to the field of instrumentation technology and can be used in analyzing the shape of periodic short signals. A device for detecting single and rarely repeated nanosecond signals is known to be long-lasting. However, this device has a low registration accuracy, which is determined by the number of parallel time interval conversion channels. In an attempt to increase accuracy, the amount of equipment is unacceptable. The closest in technical essence to the present invention is a device for recording the shape of rotating nanosecond signals: (LOW duration, containing a synchronization unit, a delay line, a control unit, a memory device, a measurement results output unit, a threshold element, a clock counter, a D / A converter the input of the delay line and the synchronization unit is connected to the device input, the output of the synchronization unit is connected to the input of the control unit, the outputs of the control unit are connected to the control the inputs of the synchronization unit, the locking device and the output unit of measurement results, the input of which is connected to the output of the storage device, the output of the synchronization unit is connected to the input of the clock counter, the output of the delay line is connected to the input of the threshold element, the output of the clock counter through the corrugated analog pre-s generator is connected to the input of the threshold element 2. The disadvantage of this device is the long time of recording impulses, due to the fact that the registration of a pulse of a complex shape takes several cycles, with than each cycle consists of non-slip bars. The presence of several cycles, due to the fact that the time converter to a digital code in each cycle, can measure only one time interval ... . The purpose of the proposed {invention is to reduce the pulse registration time. . The goal is achieved by the fact that the device for registering a form of periodic short signals containing a synchronization unit, a delay line, a control unit, a memory device: a measurement output unit, a threshold element, a clock counter J Analog converter, and the input of the delay line and synchronization unit are connected to the input of the device, the synchronization unit's code is connected to the input of the control unit, the control outputs of the control unit are connected to the control inputs of the signal clock / memory unit the unit and output measurement results, the input of the latter is connected to the output of the storage i / cTjpoftva, the output of the synchronization unit is accurate, to the input of the clock counter, the velocity line delay code is connected to the input of the threshold element, output: one clock counter through the digital analogue conversion The tel is connected to the input of the threshold element, I-NI element is introduced into two inputs, two converters of duration into the number of pulses, each of which allows converting into the number of pulses the duration of each of the pulses: in a packet, th on his ENTRY; two for 1 output per n outputs and two groups of counters with n counters each, and the output of the threshold element is connected to the input of the first duration converter into the number of pulses and with the input of the NAND element, the second input of which is connected to the output of the synchronization unit , the output of the element is connected to the input of the second converter of the duration into the number of pulses, the output of which is connected to the input of the second switch VByssod of the first converter of the duration to the number of pulses connected to the input of the first one of the first switch, n outputs of the first switch tori are connected to the inputs of the first group of n counters, n outputs of the second switchboard. connected to the inputs of the second group of n meters, the outputs of both counters are connected to the input of the memory device, FIG. 1 representation avley block -scheme1. Devices; in fig. 2 - stress diagrams for his work. The device contains a synchronization unit 1, a delay line 2, a threshold element 3, a 4 clock counter, a digital-analog: a converter 5, a transducer .6 of duration into a number of pulses, which includes the element OR 7, a delay line 8, a delay line 9, the element And 10, the element AND-NOT 1 switch 12, a group of n counters 13-1, 13-2 ,,. LZ-n, the converter 14 duration in the number of pulses, the switch 15, a group of n counters 16-1, 16-2,. . .16-p, control unit 17, memory 18 and output device for measuring results 19. The repetitive signal under study is fed simultaneously to synchronization unit 1 and, via delay line 2, to the signal input of threshold element 3. Synchronization unit 1 generates a sync pulse. 2,6), the beginning of which is determined by the leading edge of the signal under study, e the duration of the sync pulse is greater than: the maximum duration of the signal under study. The clock pulse (Fig. 2.6) is fed to the input of the counter. , 4 clock cycles, the output code of which the digital converter 5 converts into a reference voltage corresponding to the clock number and is applied to the reference I / O of the threshold element 3, where it is compared with the signal under study, comes from the line | 2 delays (Fig. 2, a), the code change in the 4 clock counter occurs at the rear at the front of the clock pulse. On the output of the threshold element .3, a sequence of normalized amplitude pulses is formed, the number and location of which is determined by the form of the signal under study (Fig. 2). to the element OR 7, and from it to the inputs of two delay lines 8 and 9, the value of the delay line 8 of the delay tg is longer than the duration of the clock from the output of synchronization unit 1 The delay value of the delay line 9 is greater than the value of holding the delay line 8 by the magnitude dj, where At. is the quantum of the conversion of the time intervals determined by the required accuracy of registration of the signal under study s The signal from the outputs — the LIED 8 and 9 delays — are fed to the inputs of the element and 10, from the output of the element AND 10 through the element OR 7 - again to the inputs of the delay lines 8 and 9. Obviously, when one positive pulse is applied to the input of the element OR 7 (provided that its duration does not exceed the value of tg) in a closed loop, from elements 7, 8, 9, 10 begins to circulate positively impulse, the duration of which with each circulation cycle is reduced by the value of At, Circulator -. qi continues until the pulse duration is less than or equal to ut. In this case, at the output of the element OR 7, a sequence of decreasing dips in terms of the duration of the pulses is formed, the number of which-jx N is equal to where t f, is the duration of the pulse entering the input of the element OR 7.

Thus, the number of pulses Ы is proportional to the duration of the pulse being converted, in this device several positive pulses arrive at the input of the converter b of the duration (number of pulses) (Fig. 2, c). At the same time, several sequences of pulses following with a period tg and shifted relative to each other in time are removed (Fig. 2, d). Using the switch 12, these sequences are divided into different channels and the following are received: first sequence (Fig, 2, d) -.in the counter 13-1, the second sequence (Fig, 2, e) - on the counter 13-2, and so on. So in the counter. 13-1 will be recorded code proportional to the duration of the first pulse received at the input of the converter b duration in the number of pulses, in the counter 13-2 - the code corresponding to the duration of the second pulse, in the counter 13-n - the code corresponding to the length of the n-th pulse. The required number of counters n is determined based on the degree of complexity of the studied signals.

With the help of the element IS-NE 11, a signal is output from the output of the threshold element 3 and is inverted, resulting in the formation of a pulse signal (FIG. 2, g), where the duration of the positive pulses determines the duration of the signal pauses (FIG. ). The signal from the output of the element IS-NE 11 is fed to the input of the converter 14 of duration to the number of pulses, the device of which is similar to the converter 6, From the output of the converter of duration to the number of pulses 14, the signal (FIG. 2, g) is fed to the switch 15, From the output of the switch the first pulse the sequence (fig, 2, and) fills the counter 16-1, the second sequence (fig. 2, k) is the counter 16-2, the third sequence (fig, 2, l) the counter 16-3, and so on. Thus, after the end of the cycle, converted into two groups, the counters will have recorded codes determining the temporal position of the signal at the level determined by the reference voltage supplied from the analogue converter. After the end of the conversion cycle by signals from the control block 17, the counter codes 13-1, 13-2,. ,,, 13-p, 16-1, 16-2 ,,,, 16-n are transferred to memory 18, both groups of counters are set in the initial state, on converters 6 and 14 of duration in the number of pulses are fed from control unit 1.7 negative pulses

setting them to their original state. Since the negative edge of the sync pulse in the 4 clock counter is increased by one, at the reference input of threshold element 3 there is already a reference voltage corresponding to the next clock, i.e., the circuit is ready for the next clock. After the registration of the pulse has been completed, the signal from the control unit 17 controls the codes of the memory device 18 to be output through the measurement output device 19 in a form acceptable for analysis. On the Start command, arriving at the control block 17, a common initial setup of all devices occurs and a new conversion cycle begins.

Thus, the whole process of transforming a single signal takes place in one cycle. The cycle duration is determined by the required number of quantization levels in amplitude and repetition period of the signal under study.

invention formula

A device for registering a form of periodic short signals containing a synchronization unit, a delay line, a control unit, a memory, an output unit — measurement results, a threshold element, a clock counter, a digital-analog converter, and an input of the delay line., And a synchronization unit are connected to the device input, output the synchronization unit is connected to the input of the control unit, the outputs of the control unit are connected to the control inputs of the synchronization unit, the storage device and the output unit of measurement results eny, .Connect last input to the output of the memory device, the synchronization unit output is connected to the input cycles counter output delay line connected to the input-jioporoBoro element output counter cycles through tsyfroanalogovy converter is connected to the input of a threshold element which distinguishes a; so that, in order to shorten the registration time, an I-NOT element was introduced into it for two inputs, two converters for pulses, two switches for n outputs, and two groups of counters with η counters each, and the output of the threshold element is connected to the input of the first durability converter to the number of pulses and with the input of the NAND element, the second input of which is connected to the output of the synchronization unit, the output of an eKeHTa NID is connected to the input of the second 702307

The first converter, the number of pulses whose output is connected to the input of the second switch, the first-converter code to the number of pulses is connected to the input of the first switch, the first outputs of the switch are connected to the inputs of the first group of n counters, the outputs of the second switch are connected to the inputs of the second group

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f7fc / ieff effbtu signal / i

eight

n counters, outputs of both groups of meters are connected to the input of the device.

Sources of information taken into account in the examination

1. USSR author's certificate

No. 501363.C. G01 R 19/04, 01/30/76,

2. USSR author's certificate №501362, cl. G 01 R 19/04, 30.01.76,